5-azido-5-deoxy-1,2-O-isopropylidene-β-L-idurono-3,6-lactone

5-amino-5-deoxy-1,2-O-isopropylidene-β-L-idofuranose 5,6-(cyclic carbamate)

1,2-O-isopropylidene-β-D-idurono-3,6-lactone